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This type of calculation works just like the Count calculation, the only difference being that it ignores repeating values and counts only for distinct non-null values.

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In fact, this error is just a special case of a more general problem, which I will introduce by going back one last time to my audience of 1,200 people Assume everyone in the audience knows which star sign they were born under (I know that astrology is not a topic that should appear in a book that s trying to be scientific, but it does provide a convenient demonstration) If I ask all the people born under Aries to raise their hands, I expect to see 100 hands there are 12 star signs, and we assume uniform distribution of data selectivity is 1/12, cardinality is 1,200/12 = 100 If I ask all the people born in December to raise their hands, I expect to see 100 hands there are 12 months, and we assume uniform distribution of data selectivity is 1/12, cardinality is 1,200/12 = 100.

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For example, imagine using a site that requires you to log in and being forced to log in for every single page! It would be much easier if you could log in once and have the web server recognize you when you make subsequent requests Also, consider how important this for an e-commerce site with shopping baskets, in which the web application must remember what shoppers have ordered as they make their way through the pages of the site To counter this problem, two important techniques are available One way is to instruct your application to store state on the server in an object of some type You could store selected information about the client in a temporary location that exists for as long as the user is browsing the site.

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How many people will raise their hands if I ask for all the people born under Aries and in December to raise their hands What about all the people born under Aries in March What about all the people born under Aries in April According to Oracle, the answer will be the same for all three questions: Selectivity (month AND star sign) = selectivity (month) * selectivity (star sign) = 1/12 * 1/12 = 1/144 Cardinality = 1,200 * 1/144 = 85 (rounded to 8 or 9 depending on version of Oracle) But the star sign Aries extends from 21 March to 19 April so there can t be any people born in December under Aries; about 35 of the 100 people born in March will be under Aries, and about 65 of the 100 people born in April will be under Aries Star signs and calendar dates.

are not independent, but Oracle s formulae for calculating combinations of predicates assume that the predicates are independent. As soon as you apply multiple predicates to a single table, you need to ask whether there is some dependency between the columns you are testing. If there is a dependency, the optimizer will produce incorrect selectivities, which means incorrect cardinalities, which could easily mean inappropriate execution plans.

The server can then remove this temporary data when the user navigates out of scope of the application or closes the browser Alternatively, you can store selected information about the client on the client s machine The following are two of the most common methods for doing this: Place the data in a small file called a cookie You can use cookies to store small amounts of data up to a limit, such as general preferences or login details Each time a user navigates to your site, those nuggets of data can be passed up as part of the request and used by the web application to achieve an automatic login or to personalize the interface Place data in a hidden <input> field within the HTML for the page a technique also used by an ASP NET feature known as viewstate, which you saw in the preceding example.

The reporting engine can sum up the values returned by the variable s main expression if you choose this type of calculation; but make sure the variable has a numeric type. You cannot calculate the sum of a java.lang.String or java.util.Date type of report variable unless a customized variable incrementer is used, as explained in the Incrementers section later in this chapter.

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